Nature of Operations (Policies)	9 Months Ended
	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Accounting	The accompanying unaudited Condensed Consolidated Financial Statements have been prepared in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”) for interim financial information and with the instructions for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of recurring accruals) necessary for a fair presentation have been included. These unaudited Condensed Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and the Notes thereto set forth in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017.The preparation of these financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, as well as disclosures of contingent assets and liabilities, at the date of the Condensed Consolidated Financial Statements, and the reported amounts of revenues and expenses during the reporting period. Actual results may differ from those estimates.
Recently Issued Accounting Pronouncements	Recently Issued Accounting PronouncementsIn February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842)” (“ASU 2016-02”), which provides guidance for accounting for leases. Under ASU 2016-02, the Company will be required to recognize the assets and liabilities for the rights and obligations created by leased assets with initial maturities greater than one year. In July 2018, the FASB also issued ASU 2018-10 and ASU 2018-11 related to Topic 842. ASU 2018-10 narrows certain aspects of the guidance issued in the amendments within ASU 2016-02. ASU 2018-11 provides entities with an additional transition method to adopt ASU 2016-02. Under this new transition method, an entity initially applies ASU 2016-02 at the adoption date and recognizes a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. ASU 2016-02, along with ASU 2018-10 and ASU 2018-11, will take effect for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The Company continues to evaluate the impact of this pronouncement with the principal impact expected to be that the present value of the remaining lease payments will be presented as a liability on the balance sheet as well as an asset of similar value representing the “Right of Use” for those leased properties. The Company plans to adopt Topic 842 under the transition method provided by ASU 2018-11. The undiscounted contractual cash payments remaining on leased properties were $210.4 million as of December 31, 2017 as indicated in Note 13 of the Company's Form 10-K and $209.8 million as of September 30, 2018 as detailed in the Liquidity and Capital Resources section of this Quarterly Report on Form 10-Q.